CN218031359U - Multipurpose electrohydraulic control operating valve assembly - Google Patents
Multipurpose electrohydraulic control operating valve assembly Download PDFInfo
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- CN218031359U CN218031359U CN202222117365.5U CN202222117365U CN218031359U CN 218031359 U CN218031359 U CN 218031359U CN 202222117365 U CN202222117365 U CN 202222117365U CN 218031359 U CN218031359 U CN 218031359U
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Abstract
The utility model relates to a multipurpose electricity liquid control operating valve assembly, include: the valve body is provided with a pressure control device and a gear control device which are communicated through a main oil way; the pressure control device comprises a pressure reducing valve and a pressure regulating and controlling energy storage buffer valve; an oil inlet cavity is arranged in the valve body, a first oil inlet communicated with the oil inlet cavity, a second oil inlet provided with a screw hole and a tubular oil inlet joint or a first screw plug connected with the screw hole are arranged on the bottom surface and one end of the valve body in a one-to-one correspondence manner. The multipurpose electro-hydraulic control operating valve assembly is provided with two independent oil inlets which are respectively communicated with an oil pump output oil path of the gear box, and the multipurpose electro-hydraulic control operating valve assembly becomes: the electro-hydraulic control operating valve assembly integrating the mechanical, electrical and hydraulic functions realizes the centralized control of a plurality of mechanisms of engineering machinery, and when one control device breaks down, the control device is not easy to interfere with each other, so that the failure can be easily eliminated, and the pressure flow requirement of a novel host four-wheel drive device can be met.
Description
Technical Field
The utility model belongs to the technical field of the operating valve technique and specifically relates to a multipurpose electricity liquid control operating valve assembly.
Background
The current loaders basically use a three-gear hydraulic control variable speed operating valve with two front gears and one reverse gear; the structure of the electrohydraulic control operating valve can be known from a novel electrohydraulic control operating valve disclosed by the utility model of the Chinese patent application number CN 201120149562.4. The traditional electro-hydraulic control operating valve has the technical problems that a pressure reducing valve, an electro-hydraulic control device of a (directional) gear and a four-wheel drive electro-hydraulic control device of the electro-hydraulic control operating valve are designed on a main valve body, if one control device fails, the control devices are easy to interfere with each other, the failure is difficult to remove, and the maintenance cost is high; therefore, the design of a multipurpose electro-hydraulic control valve assembly which has the advantages that when one control device breaks down, mutual interference is not easy, the failure removal is easy, and the pressure flow requirement of a novel main engine four-wheel drive device can be met, so that the problem to be solved is needed urgently.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming prior art's not enough, provide one kind and break down when a controlling means, be difficult to mutual interference, the troubleshooting is easy, can satisfy the multipurpose electricity liquid control operating valve assembly that the pressure flow of novel host computer four-wheel drive device needs.
The utility model has the following specific technical scheme:
a multi-purpose electro-hydraulic control pilot valve assembly comprising: the valve body is provided with a pressure control device and a gear control device which are communicated through a main oil way; the pressure control device comprises a pressure reducing valve and a pressure regulating and controlling energy storage buffer valve; an oil inlet cavity is arranged in the valve body, a first oil inlet communicated with the oil inlet cavity, a second oil inlet provided with a screw hole and a tubular oil inlet joint or a first screw plug connected with the screw hole are arranged on the bottom surface and one end of the valve body in a one-to-one correspondence manner.
Preferably, the pressure reducing valve comprises: the control valve comprises a left limiting clamp spring arranged in the valve body, a limiting sleeve sequentially arranged on the right side of the left limiting clamp spring, a control piston with a main oil hole communicated with an oil inlet cavity at the right end, a right limiting clamp spring arranged on the right side of the control piston, a pressure reducing spring and a pressure reducing cavity arranged between the limiting sleeve and the control piston, and a pressure reducing overflow port arranged on the outer side of the control piston; and a pressure reducing oil return port for connecting the torque converter is arranged at the position, corresponding to the control piston, of the bottom surface of the valve body, and a pressure measuring oil port of the torque converter is arranged at the position, corresponding to the pressure reducing oil return port, of the front surface of the valve body.
Preferably, the pressure reducing valve further comprises: and the middle limiting snap spring is arranged between the limiting sleeve and the control piston.
Preferably, the pressure regulating energy storage buffer valve comprises: the hydraulic valve comprises an inward piston which is arranged in the valve body and is arranged on the left side of a left limiting clamp spring, an energy storage end cover which is provided with a piston hole and is arranged at the left end of the valve body, an energy storage outward piston which is provided with a damping hole and is arranged in the piston hole at the left end, a limiting column which is connected with the inward piston at the right end, a small spring which is opposite to the limiting column at the right end and is connected with the energy storage outward piston at the left end, a middle spring and a large spring which are arranged between the inward piston and the energy storage outward piston and are sequentially sleeved outside the small spring and the limiting column, a one-way valve which is arranged at the left end of the valve body and is communicated with a main oil way at the outlet, an energy storage oil way which is arranged in the energy storage end cover and is respectively communicated with the damping hole and an inlet of the one-way valve, a buffering oil return port which is arranged at the bottom of the valve body and a pressure oil return port which is arranged at the position corresponding to the inward piston, and a main oil way pressure measuring oil port which is communicated with an outlet of the one-way valve is arranged on the front surface of the valve body.
Preferably, a sealing gasket and a clapboard are arranged between the left end of the valve body and the energy storage end cover; the check valve includes: the check valve comprises a check valve inlet hole, a check valve cavity, a check valve steel ball, a check valve spring and a check valve outlet hole, wherein the check valve inlet hole is formed in the partition plate and communicated with the energy storage oil way, the check valve cavity is formed in the left end of the valve body, the check valve steel ball is arranged in the check valve cavity and props against the check valve inlet hole, the check valve spring props against the check valve steel ball, and the check valve outlet hole is formed in the bottom surface of the check valve cavity and communicated with the main oil way.
Preferably, the baffle plate is provided with an orifice which is positioned beside the inlet hole of the one-way valve and is respectively communicated with the energy storage oil way and the one-way valve cavity.
Preferably, the gear control device comprises a gear shifting valve cavity arranged in the valve body, a gear shifting valve rod arranged in the gear shifting valve cavity, a right gear valve plate sleeved outside the right end of the gear shifting valve rod, a right return spring abutting against the right end of the right gear valve plate, a second screw plug abutting against the right return spring and screwed with the valve body, a left gear valve plate sleeved outside the left end of the gear shifting valve rod, a left return spring abutting against the left end of the left gear valve plate, a connecting sleeve abutting against the left return spring and screwed with the valve body, and an inserted type solenoid valve arranged at the left end of the connecting sleeve; the plug-in type electromagnetic valve is provided with an electromagnetic coil A and an electromagnetic coil B, and an electromagnetic valve rod of the plug-in type electromagnetic valve is sleeved with the left end of the gear shifting valve rod; the bottom surface of the valve body is provided with a working oil port A, a working oil port B and an oil return cavity, the front surface of the valve body is provided with a pressure measuring oil port A corresponding to the working oil port A, and the front surface of the valve body is provided with a pressure measuring oil port B corresponding to the working oil port B.
When the second oil inlet of the multipurpose electro-hydraulic control operating valve assembly is used, the tubular oil inlet joint is connected with the screw hole, and the first oil inlet and the second oil inlet are respectively communicated with an oil pump output oil path of the gear box; when the second oil inlet is not used, the first screw plug replaces the tubular oil inlet joint to be connected with the screw hole, and the second oil inlet is blocked; the pressure reducing valve of the pressure control device can adjust the set range (1.2-1.55 Mpa) of the main oil pressure according to the requirement of the gearbox, the pressure regulating and controlling energy storage buffer valve controls the pressure buffer of the speed changing valve during gear shifting to achieve stable gear shifting, and the gear control device is used for controlling the switching of three working gears of a neutral gear, an A gear and a B gear.
When the hydraulic control device works, pressure oil of an oil pump is input into an oil inlet cavity to form high pressure to push a control piston to move left, an oil inlet is communicated with a pressure reduction oil return port, a part of the pressure oil enters a torque converter through the pressure reduction oil return port to work, the pressure of the pressure reduction oil return port is 0.3-0.5Mpa and can meet requirements, a main oil pressure is set to be 1.2-1.55Mpa by a pressure reduction spring, a pressure range can be set according to different gearbox requirements, and the pressure oil enters a pressure regulation and control energy storage buffer valve and other working structures through a main oil hole in the center of the control piston.
When the gear shifting valve rod is in the neutral position, the main oil way at the gear shifting valve rod is communicated with the pressure reduction oil return port, the one-way valve is opened, the energy storage outward piston is restored to the mounting position, and the main oil pressure is 0Mpa at the moment. When the gear shifting valve rod is in a working state, the pressure reducing oil return port is closed, the main oil pressure starts to be boosted, and in order to overcome pressure instant impact during gear shifting, the inward piston moves leftwards to expose the pressure reducing oil return port for pressure relief. When the gear shifting valve rod is in a working gear state, the one-way valve is closed, partial pressure oil of the main oil way enters the left end of the energy storage outward piston through the throttling hole, high pressure is formed between the front cover and the energy storage outward piston to push the energy storage outward piston to move right, the middle spring and the large spring are compressed to enable the inward piston to move right to abut against the first limiting snap spring, an oil return opening at the inward piston is closed, the main oil pressure is increased to set 1.2-1.55Mpa, and the pressure increase time is 1.0-1.6S, so that instant impact during gear shifting of the variable speed control valve is eliminated, stable gear shifting of the gearbox is achieved, the service life of the gearbox is prolonged, and the operation comfort is improved.
The gear control device is provided with three working gears of a neutral gear, an A gear and a B gear, an electromagnetic valve rod is connected with a gear shifting valve rod, 2 electromagnetic coils are sleeved on the electromagnetic valve rod of a plug-in type electromagnetic valve and respectively control the A gear and the B gear of the gear shifting valve rod, when the 2 electromagnetic coils are closed simultaneously and the gear shifting valve rod is in the neutral gear, the main oil pressure of a variable speed control valve is 0Mpa, at the moment, a variable speed driving oil pump is in a no-load state, an oil circuit of a variable speed gear shifting system is also in a low-pressure state, the electromagnetic valve rod of the electromagnetic valve pulls the gear shifting valve rod to move left to be communicated with an oil circuit of the A gear; closing the electromagnetic coil A, and pushing the gear shifting valve rod to move rightwards to be reset to a neutral position by a second reset spring; and the electromagnetic coil B is opened, the electromagnetic valve rod of the electromagnetic valve pushes the gear shifting valve rod to move right to be communicated with the oil circuit B, the electromagnetic coil B is closed, and the first return spring pushes the gear shifting valve rod to move left to be reset to a neutral position.
Compared with the prior art, the invention has the beneficial effects that: the multipurpose electro-hydraulic control operating valve assembly is provided with two independent oil inlets which are respectively communicated with an oil pump output oil path of the gear box, and the multipurpose electro-hydraulic control operating valve assembly is formed by the following steps: the electro-hydraulic control operating valve assembly integrating the mechanical, the electric and the hydraulic functions realizes the centralized control of a plurality of mechanisms of engineering machinery, when one control device breaks down, mutual interference is not easy to happen, the failure removal is easy, and the pressure flow requirement of a novel host four-wheel drive device can be met. The gear control device can also be used for forward/reverse direction control of a marine gearbox. A middle limiting snap spring arranged between the limiting sleeve and the control piston is matched with the pressure reduction overflow port, so that the flow can be reduced from 70L/min to 40L/min. The gear control device adopts a push-pull structural design, and an electromagnetic valve is used for driving a gear shifting valve rod to switch working gears A and B, so that the gear control device has the advantage of no gear shifting; the forward and reverse gear shifting of the gear box is completed by the opening and closing of the electromagnetic coil A and the electromagnetic coil B. The main oil circuit is communicated with the oil return cavity when the gear shifting valve rod is in a neutral position, and the main oil pressure of the speed changing valve is 0Mpa when the gearbox is in a neutral position, so that the effects of energy conservation and emission reduction are achieved. The pressure regulation and control energy storage buffer valve can effectively eliminate gear shift impact, realizes the flexible connecting and discharging effect of the gearbox, and has the characteristics of high transmission efficiency, long service life and the like.
Drawings
FIG. 1 is a schematic view of the present invention;
FIG. 2 is a front schematic view of the present invention;
FIG. 3 is a schematic structural view of the bottom surface of the present invention;
fig. 4 is a schematic structural diagram of the first plug screw replacing the tubular oil inlet joint and the pressure reducing valve equipped with a middle limit clamp spring.
In the figure: the hydraulic control valve comprises a valve body 1, a main oil path 2, an oil inlet cavity 3, a first oil inlet 4, a second oil inlet 5, a tubular oil inlet joint 6, a first screw plug 7, a left limit clamp spring 8, a limit sleeve 9, a main oil hole 10, a control piston 11, a right limit clamp spring 12, a pressure reducing spring 13, a pressure reducing cavity 14, a pressure reducing overflow port 15, a pressure reducing oil return port 16, a torque converter pressure measuring oil port 17, a middle limit clamp spring 18, an inward piston 19, a piston hole 20, an energy storage end cover 21, a damping hole 22, an energy storage outward piston 23, a limit column 24, a small spring 25, a middle spring 26, a large spring 27, an energy storage oil path 28 and a pressure oil return port 29, the hydraulic control system comprises a main oil way pressure measuring oil port 30, a sealing washer 31, a partition plate 32, a one-way valve inlet hole 33, a one-way valve cavity 34, a one-way valve steel ball 35, a one-way valve spring 36, a one-way valve outlet hole 37, a throttling hole 38, a gear shifting valve cavity 39, a gear shifting valve rod 40, a right gear valve plate 41, a right return spring 42, a second screw plug 43, a left gear valve plate 44, a left return spring 45, a connecting sleeve 46, a plug-in type electromagnetic valve 47, an A electromagnetic coil 48, a B electromagnetic coil 49, an electromagnetic valve rod 50, an A working oil port 51, a B working oil port 52, a return oil cavity 53, an A pressure measuring oil port 54, a B pressure measuring oil port 55 and a buffer return oil port 56.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
As shown in figures 1 to 4: a multi-purpose electro-hydraulic control pilot valve assembly comprising: the hydraulic control valve comprises a valve body 1, wherein a pressure control device and a gear control device which are communicated through a main oil way 2 are arranged on the valve body 1; the pressure control device comprises a pressure reducing valve and a pressure regulating and controlling energy storage buffer valve; an oil inlet cavity 3 is arranged in the valve body 1, a first oil inlet 4 communicated with the oil inlet cavity 3, a second oil inlet 5 provided with a screw hole and a tubular oil inlet joint 6 connected with the screw hole are correspondingly arranged at the bottom surface and one end of the valve body 1 one by one.
Referring to fig. 4, when the second oil inlet 5 is not used, the first screw plug 7 replaces the tubular oil inlet joint 6 to block the second oil inlet 5.
The pressure reducing valve comprises: the left limiting clamp spring 8 is arranged in the valve body 1, the limiting sleeve 9 is sequentially arranged on the right side of the left limiting clamp spring 8, the control piston 11 is provided with a main oil hole 10 communicated with the oil inlet cavity 3 at the right end, the right limiting clamp spring 12 is arranged on the right side of the control piston 11, the pressure reducing spring 13 and the pressure reducing cavity 14 are arranged between the limiting sleeve 9 and the control piston 11, and the pressure reducing overflow port 15 is arranged on the outer side of the control piston 11; a pressure reducing oil return port 16 used for being connected with a torque converter is arranged at the position, corresponding to the control piston 11, of the bottom surface of the valve body 1, and a pressure measuring oil port 17 of the torque converter is arranged at the position, corresponding to the pressure reducing oil return port 16, of the front surface of the valve body 1.
Referring to fig. 4, the pressure reducing valve further includes: a middle limit clamp spring 18 arranged between the limit sleeve 9 and the control piston 11; the flow can be reduced from 70L/min to 40L/min.
The pressure regulation energy storage buffer valve comprises: the pressure-measuring valve comprises an inward piston 19 which is arranged in a valve body 1 and is arranged on the left side of a left limiting clamp spring 8, an energy-storing end cover 21 which is provided with a piston hole 20 and is arranged on the left end of the valve body 1, an energy-storing outward piston 23 which is provided with a damping hole 22 and is arranged in the piston hole 20, a limiting column 24 which is connected with the right end of the inward piston 19, a small spring 25 which is opposite to the limiting column 24 and is connected with the left end of the energy-storing outward piston 23, a middle spring 26 and a large spring 27 which are arranged between the inward piston 19 and the energy-storing outward piston 23 and are sequentially sleeved outside the small spring 25 and the limiting column 24, a one-way valve which is arranged on the left end of the valve body 1 and is communicated with a main oil way 2, an energy-storing oil way 28 which is arranged in the energy-storing end cover 21 and is respectively communicated with the damping hole 22 and an inlet of the one-way valve, a buffer oil return port 56 which is arranged on the bottom of the valve body 1, and a pressure return port 29 which is arranged on the position corresponding to the inward piston 19, and a main oil way pressure-measuring oil port 30 which is arranged on the front of the valve body 1.
A sealing gasket 31 and a clapboard 32 are arranged between the left end of the valve body 1 and the energy storage end cover 21; the check valve includes: a check valve inlet hole 33 arranged on the partition plate 32 and communicated with the energy storage oil passage 28, a check valve cavity 34 arranged at the left end of the valve body 1, a check valve steel ball 35 arranged in the check valve cavity 34 and propping against the check valve inlet hole 33, a check valve spring 36 propping against the check valve steel ball 35, and a check valve outlet hole 37 arranged at the bottom surface of the check valve cavity 34 and communicated with the main oil passage 2.
The partition 32 is provided with an orifice 38 which is positioned beside the check valve inlet hole 33 and is respectively communicated with the energy storage oil path 28 and the check valve cavity 34.
The gear control device comprises a gear shifting valve cavity 39 arranged in the valve body 1, a gear shifting valve rod 40 arranged in the gear shifting valve cavity 39, a right gear valve plate 41 sleeved outside the right end of the gear shifting valve rod 40, a right return spring 42 propping against the right end of the right gear valve plate 41, a second screw plug 43 propping against the right return spring 42 and in threaded connection with the valve body 1, a left gear valve plate 44 sleeved outside the left end of the gear shifting valve rod 40, a left return spring 45 propping against the left end of the left gear valve plate 44, a connecting sleeve 46 propping against the left return spring 45 and in threaded connection with the valve body 1, and a plug-in type solenoid valve 47 arranged at the left end of the connecting sleeve 46; the plug-in type electromagnetic valve 47 is provided with an A electromagnetic coil 48 and a B electromagnetic coil 49, and an electromagnetic valve rod 50 of the plug-in type electromagnetic valve 47 is sleeved with the left end of the gear shifting valve rod 40; the bottom surface of the valve body 1 is provided with an A working oil port 51, a B working oil port 52 and an oil return cavity 53, the front surface of the valve body 1 is provided with an A pressure measuring oil port 54 corresponding to the A working oil port 51, and a B pressure measuring oil port 55 corresponding to the B working oil port 52.
In addition to the above embodiments, the technical features or technical data of the present invention can be selected and combined again within the scope disclosed in the claims and the specification of the present invention to constitute new embodiments, which can be realized by those skilled in the art without creative efforts, and therefore, the embodiments of the present invention not described in detail should be regarded as specific embodiments of the present invention and within the protection scope of the present invention.
Claims (7)
1. A multi-purpose electro-hydraulic control pilot valve assembly comprising: the valve body is characterized in that the valve body is provided with a pressure control device and a gear control device which are communicated through a main oil way; the pressure control device comprises a pressure reducing valve and a pressure regulating and controlling energy storage buffer valve; an oil inlet cavity is arranged in the valve body, a first oil inlet communicated with the oil inlet cavity, a second oil inlet provided with a screw hole and a tubular oil inlet joint or a first screw plug connected with the screw hole are arranged on the bottom surface and one end of the valve body in a one-to-one correspondence manner.
2. The multi-purpose electro-hydraulic control pilot valve assembly as defined in claim 1 wherein the pressure relief valve comprises: the left limiting clamp spring is arranged in the valve body, the limiting sleeve is sequentially arranged on the right side of the left limiting clamp spring, the control piston is provided with a main oil hole communicated with the oil inlet cavity at the right end, the right limiting clamp spring is arranged on the right side of the control piston, the pressure reducing spring and the pressure reducing cavity are arranged between the limiting sleeve and the control piston, and the pressure reducing overflow port is arranged on the outer side of the control piston; and a pressure reducing oil return port for connecting the torque converter is arranged at the position, corresponding to the control piston, of the bottom surface of the valve body, and a pressure measuring oil port of the torque converter is arranged at the position, corresponding to the pressure reducing oil return port, of the front surface of the valve body.
3. The multi-purpose electro-hydraulic control pilot valve assembly of claim 2, wherein the pressure relief valve further comprises: and the middle limiting snap spring is arranged between the limiting sleeve and the control piston.
4. A multi-purpose electro-hydraulic control pilot valve assembly as defined in claims 1, 2 or 3 wherein the pressure regulating accumulator trim valve comprises: the hydraulic valve comprises an inward piston which is arranged in the valve body and is arranged on the left side of a left limiting clamp spring, an energy storage end cover which is provided with a piston hole and is arranged at the left end of the valve body, an energy storage outward piston which is provided with a damping hole and is arranged in the piston hole at the left end, a limiting column which is connected with the inward piston at the right end, a small spring which is opposite to the limiting column at the right end and is connected with the energy storage outward piston at the left end, a middle spring and a large spring which are arranged between the inward piston and the energy storage outward piston and are sequentially sleeved outside the small spring and the limiting column, a one-way valve which is arranged at the left end of the valve body and is communicated with a main oil way at the outlet, an energy storage oil way which is arranged in the energy storage end cover and is respectively communicated with the damping hole and an inlet of the one-way valve, a buffering oil return port which is arranged at the bottom of the valve body and a pressure oil return port which is arranged at the position corresponding to the inward piston, and a main oil way pressure measuring oil port which is communicated with an outlet of the one-way valve is arranged on the front surface of the valve body.
5. The multipurpose electrohydraulic control operating valve assembly of claim 4, wherein a sealing washer and a partition plate are arranged between the left end of the valve body and the energy storage end cover; the check valve includes: the check valve comprises a check valve inlet hole, a check valve cavity, a check valve steel ball, a check valve spring and a check valve outlet hole, wherein the check valve inlet hole is formed in the partition plate and communicated with the energy storage oil way, the check valve cavity is formed in the left end of the valve body, the check valve steel ball is arranged in the check valve cavity and props against the check valve inlet hole, the check valve spring props against the check valve steel ball, and the check valve outlet hole is formed in the bottom surface of the check valve cavity and communicated with the main oil way.
6. The multipurpose electrohydraulic control pilot valve assembly of claim 5, wherein the partition is provided with an orifice hole located beside the check valve inlet hole and respectively communicating with the energy storage oil passage and the check valve cavity.
7. The multipurpose electro-hydraulic control operating valve assembly according to claim 1, 2 or 3, wherein the gear control device comprises a shift valve cavity arranged in the valve body, a shift valve rod arranged in the shift valve cavity, a right gear valve plate sleeved outside the right end of the shift valve rod, a right return spring abutting against the right end of the right gear valve plate, a second plug screw abutting against the right return spring and in threaded connection with the valve body, a left gear valve plate sleeved outside the left end of the shift valve rod, a left return spring abutting against the left end of the left gear valve plate, a connecting sleeve abutting against the left return spring and in threaded connection with the valve body, and a plug-in type solenoid valve arranged at the left end of the connecting sleeve; the plug-in type electromagnetic valve is provided with an electromagnetic coil A and an electromagnetic coil B, and an electromagnetic valve rod of the plug-in type electromagnetic valve is sleeved with the left end of the gear shifting valve rod; the bottom surface of the valve body is provided with an A working oil port, a B working oil port and an oil return cavity, the front surface of the valve body is provided with an A pressure measuring oil port at a position corresponding to the A working oil port, and the front surface of the valve body is provided with a B pressure measuring oil port at a position corresponding to the B working oil port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222117365.5U CN218031359U (en) | 2022-08-11 | 2022-08-11 | Multipurpose electrohydraulic control operating valve assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222117365.5U CN218031359U (en) | 2022-08-11 | 2022-08-11 | Multipurpose electrohydraulic control operating valve assembly |
Publications (1)
| Publication Number | Publication Date |
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| CN218031359U true CN218031359U (en) | 2022-12-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222117365.5U Active CN218031359U (en) | 2022-08-11 | 2022-08-11 | Multipurpose electrohydraulic control operating valve assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218031359U (en) |
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2022
- 2022-08-11 CN CN202222117365.5U patent/CN218031359U/en active Active
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